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Roof Support Systems - Adobe. Longwall Top Coal Caving The Longwall Top Coal Caving (LTCC) roof support allows mining to a total seam height of more than 10 m (33 ft) by using a longwall shearer to cut the bottom 2.80 – 3 m (9.20 – 9.80 ft) and then caving the top coal .
Jul 21, 2015· Thick and ultra-thick coal seams are main coal seams for high production rate and high efficiency in Chinese coal mines, which accounts for 44 % of the total minable coal reserve. A fully mechanized top-coal caving mining method is a main underground coal extraction method for ultra-thick coal seams. The coal extraction technologies for coal seams less than 14 m thick were extensively .
Fully-mechanized top coal caving with large mining height is the main mining method for extra-thick coal seam.Howeveras the hight of coal cutting and coal caving increasesprominent problems such as severe mine pressurebehavioursevere rib spalling in working facelow top coal recovery rate and high gas emission rate and so on emerge.
1. Coal loss occuring during the production of the top coal (20 to 30 %) 2. The coal left behind the face poses danger of spontaneous combustion. 3. Poor face alignment may not only cause face roof control problems but also affect the top coal caving process 4. Floor heave behind the rear AFC is likely.
The preferred mining method for these thick coal seams is the Longwall Top Coal Caving (LTCC). The connection of both the top coal caving and its compactness are still rare; therefore, the capability of top coal caving mechanism is the most significant factor in .
May 14, 2019· The Broadmeadow mine was started using a longwall to extract coal at 4.7 m (15 ft) leaving the top section of the seam to fall into the gob. The adjacent open-cut mine has been mining the full seam section for more than 30 years, investigations and evaluations were made into the Top Coal Caving method and its suitability for the operation.
Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 0.6–1.0 m (2 ft 0 in–3 ft 3 in) thick). The longwall panel (the block of coal that is being mined) is typically 3–4 km (1.9–2.5 mi) long and 250–400 m (820–1,310 ft) wide.
Nov 01, 2017· Longwall Top Coal Caving was initially developed in the former Soviet Union and France in the 1950s and 1960s. It was then applied in the former Yugoslavia, Hungary, Romania, the former Czechoslovakia and Turkey,, .The 'Soutirage' method which was developed in France in the 1960s is considered as the original form of LTCC .The system includes a conventional longwall face operating .
Using standard longwall equipment, annual production can reach 3 million metric tons (Mt), and a maximum of 4.1 Mt has been obtained; many top-coal caving longwall working faces can obtain 200 tons per man-shift. Longwall top-coal caving is distinctly different from slice mining in thicken seam. Concerns of safety and productivity
Oct 01, 2019· 1. Introduction. In China, the reserve and production of thick seam coals accounts for 45% of underground coal resources and production, and the longwall top-coal caving technique (LTCC) is one of the major mining methods used to extract thick coal seams.1, 2, 3 The technique was first applied in the 1940s in Russia and subsequently used in France, former Yugoslavia, Hungary, Romania, .
Yancoal introduced the Longwall Top Coal Caving (LTCC) mining technology to Australia at its Austar mine in 2006. Developed in China, top coal caving uses a modified long wall mining system. LTCC allows the excavation of thick coal seams of 5 to 12 metres at one pass of the longwall machine, generating high productivity and economic returns for ...
Equipment Innovations The LTCC for Austar not only was the first new generation top coal caving face but also had a number of Australian first and world first innovations. DBT was assigned a single contract in which it coordinated all sub-contractors which included the pump station and electrical system.
Top coal caving Allison Golsby ˆ˙ ˝ ˛ Tuesday 23rd October 2012: 11.45am ˛ ˚ ˜ MAusIMM(CP), RPEQ, MEngSc(Min Man), MMinEng(Geomech), G Chief Executive Officer GPO Box 358 Brisbane Qld 4001 ˘ ˇ DipMVent allison@golsby M +61 409 008 942
stress state of the mining roadway in the soft roof–coal–floor coal seams' fully mechanized top coal caving face of Dananhu No. 1 coal mine to carry out on-site monitoring and calculation ...
Figure 1 Top coal caving mechanism used in COSFLOW simulation . The in-situ stresses should be considered properly to asses the risk and efficiency of a modern day longwall mine. In addition, the stresses released and breakage mechanism of top coal should also be considered for a Top coal Bottom coal step n step n -1
Sep 10, 2008· The longwall was a China National Coal Mining Equipment (CME) top caving face, 240 metres wide and with a 2km panel length. The operation is a 365 days, 24/7 operation. The mine, which features two top coal caving faces and which has been operating since January 2005, has planned utilisation to keep the output conveyor belt full.
caving leads to decline in coal quality and rise in production cost. Over caving also brings great security risk to operators because of the extremely harsh mining environment and complex process of top coal caving. Therefore, achieving automation for top coal caving mining is an important goal.
When the top coal caving method was initially employed at Broadmeadow it was the company's first mine in Queensland to use it. Employing this method was expected to lift recoveries from around 60% to 90% in the Goonyella Middle Seam and increase production rates, it said in a 2013 briefing.
Abstract-Longwall top coal caving (LTCC) techniques has been employed in favourable geological conditions widely in China since the mid-80s and in Australia recently. With the improvement of highly-powered face equipment and the method itself, in the past 15 years, LTCC was introduced to more challenging geological
top-coal caving operation with a large mining height at ultra-thick coal seams ... equipment for coal seams with thicknesses greater than 14 m. After the completion of the project, a coal extraction method was developed for top-coal caving with a large mining height, as well as a ground control theory for ultra-thick coal seams. ...
The disadvantages of top coal caving are that the recovery rate of top coal at both ends of the face is very low and the coal left in the gob is the source for spontaneous combustion. Therefore, the ultra-thick whole seam one slice longwall mining was developed to increase the recovery rate and safety of ultra-thick coal seams in 2009.
the top-coal caving are hard or even impossible to obtain. This is one of the key issues for automating the windows actions. For this reason, at present, the research of top-coal caving focuses on optimizing the process technology and most of it usd 2D simulation based on .
Longwall Top Coal Caving. Longwall top coal caving (LTCC) is a special type of longwall mining applicable to very thick seams (greater than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to .
Longwall Top Coal Caving (LTCC) is a special designed longwall mining method for very thick seams (thickness is more than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height.
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